To make a Fibonacci sequence, you choose the first two numbers, then use the rule ‘to work out the next number add the two previous numbers’ repeatedly. For example: the Fibonacci sequence with the first two numbers 2 and 2 is

2, 2, 4, 6, 10, 16, 26, 42, …

What is the sixth number in the Fibonacci sequence with the first two numbers 1 and 4?

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.